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Gasser Model RC Helicopters > what is avgas and would it benifit or gasser motors
 
 
JEEPWORLD2002
Key Veteran
Location: BLUEBELL PA USA

I know with my 2 stroke 4wd it love high octane but i just read about avgas, would the higher octane make the 231 and g26s run better ? do they add any thing to help with heat and ... ?

Trex600n Trex500 Mikado LoGo5003d// Hacker, CastleCreations,Ys 50, JR 7703d/8900, Radix
04-02-2008 10:57 PM
 
 
aarinsingh
Veteran
Location: Thompson, MB

The Zenoahs run best on the low octane so no point getting fancy.
04-02-2008 10:59 PM
HOMEPAGE  
 
 
JEEPWORLD2002
Key Veteran
Location: BLUEBELL PA USA

well are there not 2 timing set ups right ? a mechanical and a el right. I can see y u would say better on low octane with the mechanical timing but with the el unit i could see where high would work. But is avgas the same as 110 and 120 at the local air port or is a special mix. I am seeing 2 different ratings. usually av gas is labeled 110/120 so i am kinda tring to see whats added ?

Trex600n Trex500 Mikado LoGo5003d// Hacker, CastleCreations,Ys 50, JR 7703d/8900, Radix
04-02-2008 11:06 PM
 
 
xcellgasman101
Elite Veteran
Location: WOODWARD, OKLA....

The Zenoha motor will work on Avgas, but there is no gain,, the Zenoha motor for our heli's is not electronic spark ingition. So there really is no gain, except for higher gas price,, Use 87 to 93 oct. and you will be ok,, XGM/VGM

John Crotts
www.soonerhelicamproductions.com
04-02-2008 11:12 PM
HOMEPAGE  
 
 
dhollein
Key Veteran
Location: Tucson, AZ

Low octane for the win. Keep it simple and it's the recommended fuel anyhow
04-02-2008 11:17 PM
HOMEPAGE  
 
 
aarinsingh
Veteran
Location: Thompson, MB

Avgas at least in Canada is 100LL (stands for Low Lead), and Blue in color. There are other grades of Avgas, but I'm not really familiar with em as 100ll is all we use. It still has a lot of lead in it and it builds up in the plugs, one more thing to clean. I have never seen a build up in my Gasser plugs, and the aircraft plugs get cleaned monthly.
04-02-2008 11:55 PM
HOMEPAGE  
 
 
CJames
Key Veteran
Location: Back in KC

I used to work on UAVs with zenoah motors and we ran avgas in them because it is pretty standard stuff. Gas from one Country to another maybe a differant quality of gas, but avgas is pretty standard.

I personally liked the gas better.

Anyone want a pet rabbit?.............I found him on the road dead and I'm tired of hugging him
04-03-2008 04:49 AM
 
 
Brunobl
Senior Heliman
Location: Pomerode, Santa Catarina - Brazil

I use Avgas only.

But I don't do it for octane rating or to get fancy.

All Brazilian auto fuels have 25% alcohol added, which the Zenoah engines absolutely despise.

Also, auto fuels here tend to be completely different from one gas station to the next, and can even vary from one week to the next at the same gas station. Avgas 100LL is the same fuel everywhere.

And then there is the dreaded motorcycle-in-the living room syndrome that is totally avoided by Avgas.

Given that we do not have Coleman or similar fuels here, Avgas is my only alternative.

-------------------
Best regards,
Bruno.
04-04-2008 04:39 AM
 
 
SteveH
rrProfessor
Location: Texas

When I was flying gassers I tried a gallon of 100LL avgas, and my opinion of it was not good. It ran OK, but not as smooth as automotive gasoline. I also tried the three different automotive gasolines, 89, 91, 93 octane, and my engine ran the smoothest on 91 octane.

SteveH
Magnum Fuel
AMA76186
04-04-2008 01:08 PM
 
 
AirWolfRC
Elite Veteran
Location: 42˝ N, 83˝ W

A higher octane rating only means a higher ignition temperature. That simply means that a higher compression can be had before self ignition or knocking. It does NOT mean more power.

Also AvGas is called Low Lead but it has MUCH more lead than auto gas.
04-07-2008 02:01 AM
HOMEPAGE  
 
 
trunkmunki
Senior Heliman
Location: Bangor

100LL does have a lot of lead in it. Also, the 100/130 and 115/145 fuels haven't been around for a while (green and purple dye). Even the old 80/87 (red) octane avgas. And that is correct, the octane allows a higher compression ratio, which will generally produce more power, but not directly because of the octane. A lower compression engine should run better on lower octane fuel than on higher octanes.
04-24-2008 08:02 PM
 
 
vrwired
Senior Heliman
Location: Boulder County, CO

Quote 
A higher octane rating only means a higher ignition temperature. That simply means that a higher compression can be had before self ignition or knocking. It does NOT mean more power.

It doesnt mean more power in a single cylinder, but in more than one cylinder if you are experiencing predetonation (knocking/pinging) it will give more power.. well maybe I should say that the knocking and pinging are robbing the engine of power.. and using a higher octane to get rid of the predetonation would put the engines power to where it should be..

JR GSR260 - Mark IV Cam Mount
Trex 600NSP
Trex 600E
Trex 450SE
Hornet X3D
04-24-2008 10:52 PM
 
 
shuttlepilot
Elite Veteran
Location: Mullins, South Carolina

Avgas also has lead. I don't know if that would foul the plug quicker or not. I knew a guy way back when that would run it in his car a good bit. Ended up clogging up the catylic converter because of the high lead content. General aviation engines still rely on lead to lubricate the valve stems.

Gas is Great
Quick OD 26
04-24-2008 11:09 PM
 
 
AirWolfRC
Elite Veteran
Location: 42˝ N, 83˝ W

Quote 
. . . . aviation engines still rely on lead to lubricate the valve stems.
I think you mean the seats, not the stems.
04-24-2008 11:18 PM
HOMEPAGE  
 
 
shuttlepilot
Elite Veteran
Location: Mullins, South Carolina

No....actually the stems. You grind valve seats for fit. You lube the valve stems...

Gas is Great
Quick OD 26
04-25-2008 12:05 AM
 
 
AirWolfRC
Elite Veteran
Location: 42˝ N, 83˝ W

True with the lube - - - but not with the lead in the gas.
04-25-2008 12:13 AM
HOMEPAGE  
 
 
shuttlepilot
Elite Veteran
Location: Mullins, South Carolina

I beg to differ...but to each their own. When I flew for a living for 10 years, that's what the A&P mechanics always told me one of the reasons that avgas was leaded.

Gas is Great
Quick OD 26
04-25-2008 12:16 AM
 
 
AirWolfRC
Elite Veteran
Location: 42˝ N, 83˝ W

You might want to check this,

http://www.warmkessel.com/jr/flying/td/jd/55.jsp
04-25-2008 12:34 AM
HOMEPAGE  
 
 
trunkmunki
Senior Heliman
Location: Bangor

"In modern high speed gasoline engines, exhaust valves and the surfaces they rest on (the valve
seats) operate at high temperatures and with severe mechanical stresses. Under conditions of
high speed, and to a lesser extent high load, and in the absence of special protection of the valve
seat, it has been found that the material of the valve seat can be eroded away, i.e. “recede” into
the cylinder head. In the extreme, this can cause lower compression, poor fuel economy, high
emissions and mechanical problems.
Lead compounds formed by the combustion of lead anti knock additives prevent valve seat
recession by forming a thin non metallic layer of lead oxides and sulfates on the surface of the
seat. This acts as a lubricant, preventing metal - metal contact and welding which causes valve
seat recession."

Source: ”Prevention of Valve-Seat Recession in European Markets”, McArragher, Clark & Paesler, CEC/93/EF19, May
1993.
04-25-2008 12:35 AM
 
 
litespeed600
Senior Heliman
Location: St. Charles, Missouri

In laymans terms octane actually retards the burn rate of fuel or slows the burn rate down. Whichever you prefer. It's a waste of money unless you actually have detonation.

Tom

I'm married so you know I am no stranger to pain!
04-25-2008 01:17 AM
 
 
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Gasser Model RC Helicopters > what is avgas and would it benifit or gasser motors
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